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The Drug Influence Evaluation is a medical test made up by traffic policemen . DIE tests are administered by police who call themselves Drug Recognition Experts.
A DRE officer stops a driver, and suspects drugs. The DRE examines the driver, looking for supposed physical "indicators" of the presence of various drugs. The officer concludes that the driver is impaired by a drug, orders forced blood testing, and— before the results come back — predicts the presence of a drug belonging to a particular drug category.
Then, when the blood test does come back showing that drug, the officer's amazing prediction is taken as proof that the driver must have been impaired by that drug. How else could the officer have made that amazing prediction? [ Here's how .]